Anna is two years younger than Elsa, and Elsa is two years younger than Kristoff. If the sum of their current ages is 81, then w
1 answer:
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Answer:
70
Step-by-step explanation:
= First term =
= Common difference =
= Number of terms = 20
Sum of arithmetic progression is given by
The sum of the first 20 terms of the arithmetic sequence is 70.